Uploaded image for project: 'Specification'
  1. SPEC-164

Improve description of use of times in OBSERVATION

    Details

    • Change Description:
      Hide
      Changes as follows:
      The description of Observation time is modified so that it is clear
      that it always refers to the time of the phenomenon in the patient,
      i.e. when the sample was taken.

      For Observation types where there is a delay between sample and
      result generation time, guidance is included that this should be
      included in the archetype.
      Show
      Changes as follows: The description of Observation time is modified so that it is clear that it always refers to the time of the phenomenon in the patient, i.e. when the sample was taken. For Observation types where there is a delay between sample and result generation time, guidance is included that this should be included in the archetype.
    • Approved By:
      ARB

      Description

      The EHR IM specification is not sufficiently clear on the meaning of the times in the
      OBSERVATION.data History class. The key issue is that the time points/periods for when
      observations are recorded are understood as the times at which the data were true in
      the subject of the observation (the patient). To be more precise, we differentiate
      between 'time of sampling' and 'time of observing the sampled data'. These are almost
      always the same (e.g. when taking a pulse the time the nurse or instrument generates
      "90bpm" is within milliseconds of the time when the relevant finger or transducer did
      the sampling.

      However, in a few cases, like microbiology, a tissue sample may be taken from the body
      and then the observation (the microscopy) done miinutes or hours later. The sampling time
      is therefore different from the observation time.

      The problem is to decide what the meaning of Observation.data.origin etc is. The important
      point is that the observed values (no matter when they are observed) correspond to a state
      of the patient's body at the time of sampling. There is a tension here: in normal science
      if a certain set of data are seen, it is imperative to record exactly when those
      values were seen.

      WHat is needed here is a) a standardised meaning for Observation.data.origin in all cases,
      and b)an ability to record a second time or offset if needed for cases when the sampling
      and observation times are different.

        Attachments

          Activity

            People

            • Assignee:
              OLDthomasbeale JeffJ
              Reporter:
              OLDsamheard (Sam Heard) inactive (Inactive)
            • Votes:
              0 Vote for this issue
              Watchers:
              0 Start watching this issue

              Dates

              • Created:
                Updated:
                Resolved: